Parking Brake LED dash light not working - JeepForum.com

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post #1 of 83 Old 05-16-2013, 09:09 AM Thread Starter
CBinDC
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I upgraded my dash some time ago and have had numerous problems with wiring my LEDs (and gauges). One of my problems is that the Parking Brake light doesn't come on when push in the parking brake. I know the ground is fine because high beam LED and the brake LED use the same ground and the HB light comes on when I activate the HBs. I also checked the back of the LED and the wires look intact.

Before I did the upgrade the Parking Brake dash light worked fine. I looked under the dash to see how the light could be (??) activated. The device that I've singled out does not look damaged or corroded.

Frankly, I really don't know what I'm looking at or looking for. Could it be the brake light switch, relay, corroded wires? Like I said earlier, the light worked fine before I did the "upgrade".

Here is the switch I'm talking about:

http://www.jeep4x4center.com/brake-l...l-3215938.html

Any thoughts? Thanks.

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post #2 of 83 Old 05-16-2013, 09:54 AM
Que89YJ
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You need to measure the voltage at the led.
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post #3 of 83 Old 05-16-2013, 11:46 AM
JWELK
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I would suggest the switch is misaligned or unplugged. As it is easier to access, that would be my first point of access.
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post #4 of 83 Old 05-16-2013, 11:51 AM
Michaelgoesrawr
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There is a switch on your parking brake itself if I'm not mistaken. It's at the top under the dash. There is a single wire going to it. It's this way on my '88 and I cannot see your year on the mobile app so I apologize if this is not the case.

As far as I know the switch you posted is the actual brake light switch for the brake pedal.

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post #5 of 83 Old 05-16-2013, 12:25 PM Thread Starter
CBinDC
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Quote:
Originally Posted by Michaelgoesrawr
There is a switch on your parking brake itself if I'm not mistaken. It's at the top under the dash. There is a single wire going to it. It's this way on my '88 and I cannot see your year on the mobile app so I apologize if this is not the case.

As far as I know the switch you posted is the actual brake light switch for the brake pedal.
I have an '89, so the same. I hate the inability to see a persons specs on the mobile app. It's pretty bad. I hope they fix that.

So the switch I posted is the switch for the tail lights? Hmm

On page 5-10 of the manual, it shows a "wire switch connector". I can't find any info on what this for exactly. Is this the possible culprit?

image-1460649645.jpg

I still need to check the voltage at LED though. I can't get to it right now but will later.
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post #6 of 83 Old 05-16-2013, 12:40 PM
Michaelgoesrawr
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Yes If your voltages are correct when the pedal is pressed and left in the lock position it completes the ground for the parking brake light. It's about the size of the door switches. Just a plunger with a spring and one connector.

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post #7 of 83 Old 05-16-2013, 12:52 PM Thread Starter
CBinDC
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So I should check if the hot wire to the LED is getting 12v? If not, what next?
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post #8 of 83 Old 05-16-2013, 12:58 PM
Michaelgoesrawr
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Personally, because I'm not very good with a meter, I'd start at the switch and see if something happened to the wire. Lol

Edit: I forgot you said it worked before. My knowledge is spent on the subject at this point. Maybe que will be able to help you. Sorry bud.

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post #9 of 83 Old 05-16-2013, 01:03 PM Thread Starter
CBinDC
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Yeah the switch will probably be last thing I check because its probably still good.
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post #10 of 83 Old 05-16-2013, 01:05 PM
Michaelgoesrawr
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Quote:
Originally Posted by CBinDC
Yeah the switch will probably be last thing I check because its probably still good.
Agreed. The likely hood of the switch going bad when you replace the bulbs isn't very high. Although it with these Jeeps, stranger things have been known to happen.

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post #11 of 83 Old 05-16-2013, 01:26 PM Thread Starter
CBinDC
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Very true.
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post #12 of 83 Old 05-16-2013, 01:56 PM
Gage56
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dont want to sound dickish but you sure you have the LED in the right way ? if not try pulling it out and flipping it around to make sure the polarity is right

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post #13 of 83 Old 05-16-2013, 02:02 PM
Que89YJ
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exactly why I said measure the voltage. If the voltage its there the led is the issue.

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post #14 of 83 Old 05-16-2013, 03:26 PM
Old4X
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You understand the switch carries the ground, not the hot, right? The bulb should always have power, just needs grounding to light.

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post #15 of 83 Old 05-16-2013, 03:31 PM Thread Starter
CBinDC
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Quote:
Originally Posted by Old4X
You understand the switch carries the ground, not the hot, right? The bulb should always have power, just needs grounding to light.
Well, I know that without a good ground the light won't work. Am I right?
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